HIV基因组为单股负链RNA()
参考答案:错
解析:
为两条相同的正链RNA相连的一个二聚体
The taxi ________ I usually took to my office was destroyed in a traffic accident?
A.in which
B.by which
C.which
D.with which
食盐水能导电是因为存在下列可以自由移动的微粒( )
A.H2O
B.NaCl
C.Na和Cl
D.Na+和Cl-